package com.itheima.reggie.Filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @title: LoginCheckFilter
 * @Author 椎名真白
 * @Date: 2022-04-26 9:54
 * @Version 1.0
 */

@WebFilter(filterName = "LoginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        String remoteAddr = request.getRemoteAddr();
        //log.info("访问者的IP地址:{}" ,remoteAddr);
        //192.168.68.57
        if(remoteAddr.equals("192.168.68.57")){
            return ;
        }

        //获取当前访问的URI路径
        String requestURI = request.getRequestURI();


        //log.info("拦截到请求：{}",requestURI);

        String[] urls = {
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login",
                "/user/sendMsg"
        };
        boolean check = check(urls, requestURI);
        if (check) {
            //log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request, response);
            return;
        }


        //判断用户是否登录
        //Long 大写 或不转型才可跳转至登录界面
        if ((Long) request.getSession().getAttribute("employee") != null) {
            BaseContext.setCurrentId((Long) request.getSession().getAttribute("employee") );
            filterChain.doFilter(request, response);
            return;
        }

        //4-2、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }

        //用户未登录 响应code=0和NOTLOGIN
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    private boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
